* {
    margin: 0;
    padding: 0;
    list-style: none;
}

body>div {
    display: flex;
    flex-direction: column;
    align-items: center;
}
body>div>div {
    margin-top: 20px;
    display: flex;
    flex-direction: row;
}
ul {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
}
ul li {
    display: flex;
    flex-direction: row;
}
ul li div {
    width: 50px;
    padding: 20px;
    border: 1px solid black;
    text-align: center;
}
a {
    color: blue;
    text-decoration: underline;
    cursor: pointer;
}